Nitrocellulose composition



Patented Nov. 26,1929

UNITED STATE PATET IFFICE JOHN C. EMHARDT, OF NEWBURG-H, NEW YORK, ASSIGNOR T0 E. I. DU PONT DE NE- MOURS & COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE NITROCELLULOSE COMII POSITION No Drawing.

, high-production processes of manufacture.

When softeners of the type indicated are used in the ordinary manner they give a coating so sticky that the goods cannot be handled with desired rapidity in the machines, i. e. cannotbe folded, rolled, and so on substantially immediately after coating. The present composition provides a proper coatingfor the purposes indicated. It is the majorobject of the invention to provide such a composition. 1

According to the present invention there is used in the composition a suitable quantity of mineral oil to overcome and eliminate the stickiness imparted by the vegetable oil. The

oily paraffin or' naphthene hydrocarbon. The

coating resulting from the composition, after evaporating the volatile solvents from a coating composition having the composition of the invention as its base, will not be tacky even when hot. This permits the coated goods, e. g. leather substitute, to come in contact with itself or the machine immediately, without objectionable results. p,

It is to be noted that the vegetable oils mentioned are non-solvent softeners for cellulose nitrate, i. e. while softeners they are not solvents. It is the particular present desire to provide compositions which shallbe free from solvent softeners, e. g. tricresyl phosphate, dibutyl phthalate, etc., that is, will have their softener content composed of non-solvent softeners. The use of the mineral oil, meets this condition since it is a non-solvent soft- When the mineral oil is used with the vege-' Application filed September 21, 1926. Serial No. 136,896.

table oils as specified no difiiculty is experienced from precipitation of the pyroxylin.

COIIIPOSltlOIlS in accordance with the invention may be as follows (parts byweight) Pigmented Range Preferred N itrocellulosani 16 16 i Pigment (dry) 10 10 Vegetable oil 33. 32-32. 3 32. 98 Mineral oiL 68- 1; 6 1. 02

- Olear Range Preferred Nittoce11u1ose 16 16 Vegetable oil 15. 68-15. 2 '15. 52 Mineral oil .32- .8 18

As will be understood by those skilled in the art of making artificial leather, the mixtures covered by the above examples are dissolved in an amount of a suitable solvent (e.

g.,-benzol 3, ethyl acetate'2) to give a desired jelly, 114 parts by weight of the said solvent giving substantially a 16 ounce jelly, but other jellies may, of course, be used; and the resulting solution is then applied to a fabric and allowed to evaporate in the regular way. The particular difference, in manufacturing the present goods, from manufacturing prior goods, will be found in the increased speed 'With which the operation can be carried on,

due to the elimination of stickiness.

The compositions may be used for under coats or top coats as experience and desire dictate. The pigment may be any desired one, as bone desirably blown castor, blown cottonseed, or blown rapeseed. In the pigmented formula, it will be seen that the mineral oil, is from 2%, substantially to, but not including, 5% of the total on; while in the clear black, and the'vegetable oil is, as before noted,

formula the mineral 'oil varies from 2% to 5% of the total oil. Both formulas can vary in blown oil content from 1 to 3 parts of oil to 1 part of nitrocellulose. In the pigmented formula the pigment content can vary from 1 to 2 parts of pigment-to 1 part of nitrocellulose. Ordinarily, of course, the

pigmented composition Will be used. for under coats and the clear composition for the top coat.

While the use of the, composition in the making of leather substitute has been more particularly referred to, it will be understood that it may be otherwise used. VVhile'more particular reference vto blown oils has been made, it will be understood that the invention is applicable to compositions containing raw oils which are non-solvent softeners for cellulose nitrate.

I claim:

1. A homogeneous nitrocellulose composition free from solvent softeners and containing nitrocellulose, a blown seml-drying vege table oil, and non-volatile mineral oil in an amount substantially between 2 and 5% of the total mineral and vegetable oil content.

' 2. A homogeneousnitrocellulose composition free from solvent softeners and containing nitrocellulose, a blown vegetable oil of the group, castor, cottonseed and rapeseed, and non-volatile mineral oil in an amount substantially between 2 and 5% of the total mineral and vegetable oil content.

3. A homogeneous pyroxylin coating composition, free from solvent softeners and containing, as a softener for the coating, a blown semi-drying vegetable oil in an amount that,

. if used alone, would impart stickiness to the 'coating, and non-volatile mineral oil as a thickiness preventive.

4. A homogeneous nitrocellulose composition containing nitrocellulose, and, as a softener for the nitrocellulose a non-solventsoftener mixture comprising a blown vegetable oil ofthe group, castor, cottonseed and rapeseed, and non-volatile mineral oil in an amount substantially between 2 and 5% of the total mineral and vegetable oil content.

5, A homogeneous pyroxylin coating composition, free from solvent softeners and containing, as a softener for the coating, a blown semi-drying vegetable oil, and a non-volatile mineral oil as a stickiness preventive.

In testimony whereof I affix my signature.

JOHN C. EMHARDT. 

